A P2P authority delegation and access control model is proposed. The model includes three main protocols, namely, authority delegation protocol, resource retrieval protocol and access control protocol. According to the authority delegation protocol, the delegation initiator PEER_S selects a peer with a high reputation as the delegated peer PEER_D and issues an authority delegation certificate Cd. According to the resource retrieval protocol, PEER_D selects a resource provider with a high reputation to send a resource request. According to the access control protocol, the resource provider PEER_R performs access control through the reputation certificate set Cts of the resource requester and the authority delegation certificate Cd. Based on the colored Petri net to verify the reachability and other properties of the protocol model, the protocol is simulated using CPN Tools. Keywords: peer-to-peer network; authority delegation; reputation; Petri net
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